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Axially oriented directional solidification process in magnetic field

A directional solidification and magnetic field technology, applied in the field of metal materials, can solve problems such as inability to obtain, and achieve the effect of suppressing temperature fluctuations and suppressing melt turbulence

Inactive Publication Date: 2006-03-01
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Materials grown along the easy axis can often achieve the best physical or mechanical properties, but some materials such as (TbDy)Fe 2 Orientation along the easy axis direction cannot be obtained in common directional solidification techniques such as AlTi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] An axial superconducting magnetic field is added to the Bridgeman directional solidification device. The liquid-solid interface of directional solidification is controlled in the central area of ​​the magnetic field. The direction of directional solidification is parallel to the direction of the magnetic field, and the pre-prepared polycrystalline Tb 0.3 Dy 0.7 Fe 1.95 The bar is installed. Then evacuate to -2 Pa, filled with argon to 0.1MPa.

[0018] Then implement as follows:

[0019] (1) put Tb 0.3 Dy 0.7 Fe 1.95 The rod is heated to melt. The temperature gradient at the solid-liquid interface was maintained at 30°C / cm (after applying the magnetic field, the actual temperature gradient would increase by 25-50%).

[0020] (2) After the bar is heated, start the superconducting static magnetic field, and the magnetic field strength is 4T.

[0021] (3) Solidify 1.5cm at a speed of 5mm / s, then stop moving or pull down, and stand for about 20 seconds to solidify ...

Embodiment 2

[0025] An axial superconducting magnetic field is added to the zone melting directional solidification device. The zone melting length is 4cm, and the liquid-solid interface of directional solidification is controlled in the central area of ​​the magnetic field. The direction of directional solidification is parallel to the direction of the magnetic field, and the pre-prepared polycrystalline Tb 0.3 Dy 0.7 Fe 1.95 The bar is installed. Then evacuate to -2 Pa, filled with argon to 0.1MPa.

[0026] Then implement as follows:

[0027] (1) put Tb 0.3 Dy 0.7 Fe 1.95 The rod is heated to melt. The temperature gradient at the solid-liquid interface is maintained at 250°C / cm (after applying the magnetic field, the actual temperature gradient will increase by 25-50%).

[0028] (2) After the bar is heated, start the superconducting static magnetic field, and the magnetic field strength is 4T.

[0029] (3) Solidify 2cm at a speed of 5mm / s, then stop moving, and stand for about ...

Embodiment 3

[0033] An axial superconducting magnetic field is added to the melting and directional solidification device in the liquid metal cooling zone. The zone melting length is 4cm, and the liquid-solid interface of directional solidification is controlled in the central area of ​​the magnetic field. The direction of directional solidification is parallel to the direction of the magnetic field, and the pre-prepared polycrystalline Tb 0.3 Dy 0.7 Fe 1.95 The bar is installed. Then evacuate to -2 Pa, filled with argon to 0.1MPa.

[0034] Then implement as follows:

[0035] (1) put Tb 0.3 Dy 0.7 Fe 1.95 The rod is heated to melt. The temperature gradient at the solid-liquid interface is maintained at 800°C / cm (after applying the magnetic field, the actual temperature gradient will increase by 25-50%).

[0036] (2) After the bar is heated, start the superconducting static magnetic field, and the magnetic field strength is 4T.

[0037] (3) Quickly pull down 1.0 cm at a pull-down ...

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PUM

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Abstract

The present invention belongs to the field of metal material technology, and the easy axis orientated directional solidification process in magnetic field includes the following steps: 1. heating the product to over the melting point to dissolve the impurity fully; 2. applying axial strong magnetic field parallel to the directional solidification direction; 3. downwards pulling the directional solidifying part in the speed higher than 3 mm / s inside the magnetic field; 4. stopping downwards pulling to obtain the axial easy axis orientated solidified structure in the solidified part; and 5. directional solidification. The present invention needs no additional seed crystal, can ensure the easy axis orientation growth of the crystal during directional solidification, and has high production efficiency and high finished product rate.

Description

technical field [0001] The invention relates to a method in the technical field of metal materials, in particular to a directional solidification method oriented along an easy axis in a magnetic field. Background technique [0002] Magnetocrystalline anisotropy is related to the change of temperature. It is generally defined that after the temperature exceeds the Curie point, the magnetocrystalline anisotropy of magnetic materials disappears with the disappearance of magnetism. In recent actual observations, even in the far Near the melting point above the Curie point, residual magnetocrystalline anisotropy still exists. Therefore, in the melt under the action of a magnetic field, if ΔE=u 0 ΔxVH A 2 / 2>kT is satisfied, u 0 is the vacuum permeability, Δx=x 1 -x⊥ is the anisotropy of paramagnetic susceptibility, V is the volume of grains in the melt, H A is the magnetic field strength, k is the Boltzmann constant, T is the absolute temperature, ΔE represents the magne...

Claims

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Application Information

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IPC IPC(8): C22F3/02
Inventor 邓沛然李建国
Owner SHANGHAI JIAO TONG UNIV
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